Combo bdx rangefinder and scope - SIG SAUER Sierra6BDX 2-12x40mm Rifle Scope, 30mm Tube, Digital Second Focal Plane w/Kilo1600BDX 6x22mm Rangefinder

Work's great but I have a guestion is there away to be able to make the scope shoot farther than 800 yds one of my friends has this set up but he has an area that is cut in the top scope cover and can add click's to shoot farther he says his rangefinder tells him how many click's to add after 800 yds ???????